P bellina -- what do you s'pose these spots are?

[MJG]

I received this beauty about 3 weeks ago, in the middle of a snowstorm with no heat pack.

It looked then exactly like it looks now -- beautiful except 2 leaves are lighter green with darker green spots. Those 2 leaves also have no waxy coating.

The vendor suggested that it might be a nutrition issue or something in the leaves triggered by the cold. He said to foliar feed it with my regular fertilizer, and that it would probably clear up. I did, and nothing changed for better or worse.

Do you think this is cold damage, or nutritional, or "something else in the leaves triggered by the cold" as the seller put it? I'm actually not too freaked out about it, as the plant overall looks so healthy. Just very curious and trying to learn. Is there something else I should do about it? Thanks.